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12 Serial interface RS 485
12.1 General
The PosCon contain a serial port (RS 485). Via this port, all data can be acquired, which is available
on the analog output. All types of measurements can be set, the buttons can be disabled and ena-
bled and more functions are available.
There are two modes, in which the RS 485 can be run.
- Command mode: The sensor is a single sensor connected to the serial port. No address is
necessary. No time consuming protocol overhead.
- Protocol mode: The RS 485 can be run as a bus with one master and several sensors as
slaves. Each sensor has his own address.
The sensor comes with a factory set address of 0xFF
The sensor will start always in command mode, whether it has the address 0xFF or his own address.
The address can only be changed in protocol mode.
Note: The address remains stored even after power down.
Note: Keypad buttons cannot be pressed during the transmission of data.
Note: When sending $0A8 or $FF to stop continuous data mode ($0A) both the digital and
analog outputs will give a brief on/off (digital output), and a current spike (analog out-
put. When using continuous data mode, it is recommended that you ignore both the
digital and analog output for a 1 second period after sending ($08 / $FF).
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